Pulp-strainer.



No. 834,596. PATENTED OCT. 30, 1906.

J. WALTERS. PULP STRAINER.

APPLICATION FILED FEB. 9. 1906.

3 SHEETS-SHEET 2.

[NVENTGR Jilarneys 1110. 834,596. PATENTED OCT. 30, 1906.

' J. W. WALTERS.

PULP STRAINER.

APPLICATION FILED FEB. 9, 1906.

3 BHEETSSHEET 3.

[NVENTOR Allorneys screen, a suitable inlet-pipe being JULIUS WM. WALTERS, OF GLENS FALLS, NEWYORK.

PULP-STRAINER.

Specification of Letters Patent.

Patented Oct. 80, 1906.

Application filed F ary 9, 1906. Serial No. 300,248.

To all] whom it may concern.-

Be it known that I, J ULIUs WM. WALTERS, a citizen of the United States, residing at Glens Falls, in the county of Warren and State of New York, have invented new and useful improvements in Pulp-Strainers, of which the following is a specification.

The present invention relates to pulpstrainers, and has for its 'pbject the provision of a strainer which will receive the pulp as it comesfrom the digester or grinder, hydrate or impre nate it with water and screen it thorough y, remove from the pulp all unground slivers or foreign substances, keep the screen plates or grids always clear of clogging substances, to the end that the flow of pulp throu h. the thoroughlyscreened and hydrate saturated pulp in regulated quantity to the deliveryassage.

Stated genera comprises in its simplest form a suitable vat or tub within which is mounted a horizontal rovided to deliver the pulp to t e vat a ove the screen. Mounted centrally of the vat and screens is a hollow revolving shaft connected with a suitable supply of water, said shaft having a, spray-pipe extending, radially therefrom above the screen, by means of which the pulp may be hydrated or saturated with water and brought to the proper screening consistency. The central shaft carries a ring or frame closely adjacent to the screen, which supports a hooded scraper arran ed in close proximity to the upper surface 0 the screen and adapted to scra e up all the slivers and foreign substances w ich fail to pass through the screen and eject them throu h a suitable opening in the side of the vat. eneath the screen and supported and driven by the central shaft are two or more ro e'ller-like blades or fans, the number of w ic must be equal, as the line of effort or pitch-line of these blades is counterpoised to one another, or, in other words, they are placed upon the shaft in a position to create alternate downward and upward movement upon the air and hydrated pulp descending upon them through the screen-plate, so as to produce a uniform progressive wave movement of the ulp and cause the same to be intermittently orced upwardly to dislodge any clogging substances from the screen or grid interstices and revent filling of the screen. The vat is provided at its bottom with a lateral outlet,

ly andbriefly, the strainer through which the screened pulp is delivered an adjustable dam bein provided for sai outlet by means of whic the pulp-delivery may beregulated.

In order that the invention may be clear to those skilled in the art, I have illustrated my invention in the accompanying drawings and in the detailed description hereinafter shall refer to said drawings by suitable referencenumerals, like numbers indicating like parts in the several views.

In said drawings, Figure 1 is a central vertical section of a strainer embodying my invention. Fig. 2-is a sectional view to show the sliver-delivery openings. Fig. 3 is a plan view of the strainer. Fig. 4 is a detail view of the strainer-shaft and its associated parts. Fig. 5 is a view of a form of my invention in which a plurality of screen-plates are used.

Referring to the drawings, 2 indicates a circular pulp-receptacle or receiving-vat of any suitable construction and dimensions provided with suitable hand-holes and covers 2 to permit inspection of the strainer interior. Mounted within said receptacle or vat 2 is a screen 3. ed by ring-cleats 4, secured to the vat, and has suitable screening perforations or interstices.

Mounted'centrally of the vat 2 and passing through the screen 3 is a hollow shaft 5, which is supported in any suitable bearings and driven by any suitable or usual driving mechanism, said shaft 5 being connected with a suitable water-supply. Secured to said shaft 5 in close proximity to the upper surface of the screen 3 is a wheel 6, the rim 7'of which fits closely the angle formed by the upper-screen surface and the wall of the vat, as clearly shown in Figs. 1 and 2. Carried by said wheel 6is afiat sliver collecting and ejecting blade or scraper 8, preferably, having a curved edge, as shown in Fig. 3, which blade lies against the upper surface of the screen and has a beveled edge, the more readily to ick up any unscreened particles or slivers ying upon the screen-surface as the scraper sweeps over it. In order that any particles picked up by the scraper '8 may not sim 1y slide over it and escape, I-provide a hood 9, which projects forwardly of the scra er and serves to retain any matter collecte during ghe sweep of the scraper over the screen-surace.

From the foregoing it will be seen that as Said screen 3 is supportthe shaft 5 is rotated during the operation of the strainer the wheel 6 and scraper 8 carried thereby will be revolved and scraper 8 will gather beneath the hood 9 all slivers and foreign substances upon the screen. It is apparent that owing to centrifugal action the tendency of the slivers and particles gathered by the hooded scraper will be to travel outwardly along the scraper, and the scraper 8, as above stated, is preferably curved along its edge, as shown, to augment and aid this centrifugal travel of the scraped-up material. It will be observed, furthermore, that the hood 9 is outwardly flared or wider at its outer end, so that as the bulk of the scrapings increases at the outer end of the scraper the capacity of the hood will be sufficient to preverlit escape of any of the scrapings into the pu p.

In order that the scrapings from the screensurface may be ejected, the vat 2 is provided with a sliver-discharge opening 10 on a level with the screen-surface, to which dischargeopening the hooded scraper 8 will deliver its picked up matter at each revolution of the shaft 5. The ring 7 of the wheel 6 is cut away at the point Where the scraper 8 is secured to it, (see Fig. 2,) so as not to obstruct the opening 10 at the time the scraper sweeps past it, but to permit the ejectment of the foreign substances, while at all other times the closely-fitting ring|7 will close and prevent the escape of pulp through said opening.

In order that the pulp may be thoroughly hydrated and brought to the proper screening consistency, a spray-pipe 11 is provided above the screen, the end or nozzle of the pipe 11 being preferably flattened, as shown, and cutaway at an angle in order to secure the proper trajectory and uniform radial distribution of the et.

Below the screen 3 and fixed to the shaft 5 are fans or propeller-blades 12, which as the shaft 5 is rotated will produce a swirling or wave-like motion of the pulp beneath the screen. The effect of'this wave movement is to intermittently force the pulp upwardly through the interstices or perforations of the screens 3. The result of this is to clear the screen perforations or grids of any clogging substances that may become lodged therein, which are forced up onto the surface of the screen 3 and swept up and ejected by the scraper 8 in the manner hereinbefore described.

The vat 2 is provided near its bottom With an opening 13, through which the screened pulp passes to a chamber 14, having a pulpdehvery outlet 15, leading to a pulp-delivery passage 16. The said outlet 15 has a regulating-dam consisting of a plate 17, which slides in vertical ways 18, Figs. '1 and 3, a screw-rod 19 being provided to secure adjustment of the said plate 17 and regulate the flow of pulp as desired.

It is sometimes desirable to economize.

floor-s ace Without reducin the capacity of the pu p-strainer, and in ord er that this may be done and yet preserve all the valuable features of the strainer which I have invented the form shown in Fig. 5 of the drawin s herewith is provided, which resembles in alfits general features the strainer hereinbefore described, but in which instead of a single screen of large dimensions a plurality of screens of relatively small dimensions are mounted one above the other, suitable pulp inlets and outlets bein provided for each screen of the battery ant? sliver scraping and ejectin and screen-clearin instrumentalities, simi 'ar to those described above in connection with the single-screen strainer, being provided for each of the screens in the stac or battery of superposed screens.

Referring to the form of the invention shown in Fig. 5, 20 indicates a vat similar in all respects to that shown in the other figures and hereinbefore described, except that it is smaller in diameter, so as to occupy a minimum amount of floor-space, and is increased in height to compensate for this reduction in diameter. Within this vat 20 are mounted a number of screens 21, similar in all respects to the screen hereinbefore described, each screen being provided with the hereinbefore described the slivers on the upper screen-surface and having below the counterpoised fans to produce the progressive wave movement in the pul and clear the grids of the screen. The said scraper 22 and fans 22 are carried by a vertical hollow revolving shaft 23, which is suspended from the top 24 of the vat 20 and is connected at its lower end by a rotating water-joint 25 with a suitable water-supply, the said shaft 23 having at its upper end a bevelgear 26, which connects with any suitable driving-shaft 27.

A pulp-inlet pipe 28 is provided, which ipe has a plura ity of delivery branches 29 llaading to the vat above the several screens, so as to give a proportionate amount of pulp to each of the screens, this ulp when delivered to the screens being su ject to the same screening and sliver-collecting action described hereinbefore.

The sliver collecting and ejecting instrumen'talities 22 deliver to a sliver-box 31, arranged vertically on the side of the vat, as shown, so that the sliver scraping and ejecting blades will deliver the material collected through their individual sliver-delivery 0 enings in the side of the vat to this sliverox, and the accumulated mass of slivers, together with any small amount of Ipulp which may be ejected by the sliver-col ectmg instrumentalities, will pass down the sliver-box 31 and be delivered to the lowermost screen of the series through a suitable conduit 30, this lowermost screen being preferably not conhooded scraper 22 to collect a receiving-vat, a screen,

nected with the pulp-inlet pipe 28, as this ings from the other screens and subject to a second straining operation in order that there may be no loss of pulp.

Each of the screens is rovided with se arate outlet-gates 32, so t iat each unit de ivers its screened pulp, the said outletgates to a common pulp-outlet or delivery leading passage 33, and in order that the pulp from the up or screens of the series may ass down the de ivery-passage 33 without 0 structing or interferlng with the pul -delivery from the lower screens I preferably rovidethe downwardly and outwardly inc ined guard or deflector plates 34 at the mouth of each pulp-delivery opening, which deflect the descending body of pulp in the passage 33 away from the pulp-outlets 32, and so prevent interference with or damming of the pulp as it flows from the screens.

, While I have shown particular embodi ments of my invention, I do not confine'myself to the precise constructions herein shown and described, as all equivalent expedients and mechanical variations within the skill of the mechanician are obviously within the purview of my invention.

Having described my invention, I claim- 1. In a ulp-strainer, the combination with a receiving-vat, of. a horizontally-arranged screen in said vat, sliver collecting and ejecting means above said screen, and means beneath said screen for clearing the screen-openings.

2. In a pulp-strainer, the combination with a receiving-vat, of a screen in said vat, sliver collecting and ejecting means in operative relation to the screen on one side, and means on the opposite side of said screen for clearing the screen-openings 3. In a pulp-strainer, and in combination, a screen, means on one side of the screen for collecting and ejecting the unscreened material lodged on the screen-surface, and means on the opposite side of the screen to clear the screen-openings and force the retained matter into the path of the collecting and ejecting instrumentalities.

4. In a pulp-strainer and in combination,

and a sliver collecting and ejecting scraper rotatable over the surface of said screen.

5. In a pulp-strainer and in combination, a receiving-vat, a screen, and a hooded sliver collecting and ejecting scraper rotatable over the surface of said screen.

6. In a pulp-strainer and in combination, a receiving-vat, a screen, and a rotatable sliver collecting and ejecting scraper having a curved edge.

7. In a pulp-strainer and in combination, a receiving vat, a screen, a rotatable sliver collecting and ejecting scraper, and an outwardly-flaring hood for said scraper.

8. In a pulp-strainer and in combination, a receiving-vat having a sliver-delivery openin a screen in said vat, a rotatable sliverco lecting scraper to sweep the screen-surface and eject the unscreened matter through said opening, and means to prevent the escape of pulp through said sliver-ejectment o enmg. 9. In a pulp-strainer and in com inatio'n, a receiving-vat having a sliver-delivery opening, a scre'enin said vat, a rotatable scraper to sweep the screen-surface and eject the unscreened matter through said opening, and means to close said opening except at the time of delivery through it of the unscreened matter.

10. In a pulp-strainer and in combination, a receiving-vat, having a sliver-delivery opening, a screen. in said vat, a rotatable scraper to sweep the screen-surface, and 'eject the unscreened matter through said opening, and a rotatable ring to close said 0 ening except at the time of delivery througli it of the unscreened matter.

11. In a pulp-strainer and in combination,

a receiving-vat, having a sliver-delivery opening, a screen in said vat, a centrally-placed shaft traversing said vat, a scraper carried by said shaft and adapted to sweep the surface of said screen and eject the unscreened matter through said opening, and a ring supported b and rotatable with said shaft to close sai opening against the egress of pulp, said ring having a cut-away portion in radial alinement with said scraper to permit the scraper to eject the unscreened matter.

12. In a pulp-strainer,- the combination with a circular rece ving-vat, of a horizontal screen mounted therein, a vertical rotary shaft traversing said vat, and means carried by said shaft below said screen for im arting a progressive wave movement to the ody of pulp elow the screen to force it upwardly through the screen-perforations.

13. In a pulp-strainer, the combination with a circular receiving-vat, of a horizontal screen mounted therein, a vertical rotary shaft traversing said vat and fan-blades mounted on the said-shaft below said' screen for im arting a pro essive wave movement to the body of pulp elow the screen to force it upwardly through 14. In a pulp-strainer, the combination with a circular receiving-vat, of a horizontal screen mountedtherein, a rotatablehollow shaft traversing said vat, a sprayipe carried by said shaft and delivering a ove the screen, a sliver collecting and ejecting scraper to sweep the u per surface of said screen, and a fan carried y said shaft below the screen for imparting a wave movement to the pulp,

and intermittently force it upwardly through the screen-perforations.

.15. In a pulp-strainer, the combination of a receiving-vat, a horizontal screen mounted in said vat, a centrally-placed hollow shaft the screen-perforations.

outlets delivering to said vInon sliver-passage to which inlets and outlets, a p

terial from the screensurfaces,.means below said screens for clearing the screen-openings,

and pulp-outlets for each of said screens.

In a pulp-strainer, the combination of a circular receiving-vat, a plurality of horizontally-arranged screens in said vat, means for delivering pulp to each of said screens, a rotatable shaft traversing said vat, and screens, means carried by said shaft above said screens to collect the unscreened material from the screen-surfaces, means carried by said shaft below said screens to clear the screen-openings, and pulp-outlets foreach of said screens.

19. In a pulp-strainer, the combination of a receiving-vat, of a plurality of horizontal screens in said vat, a pulp-feed pipe having a plurality of branch pipes, one for each screen, a pulp-delivery pipe, and independent screendelivery-pi e. 20. In a pulp-strainer, the combination of a receiving-vat, a plurality of horizontal screens therein, a plurality of pul -inlets, one for each of said screens, a plura 1ty of pulpoutlets, one for each of said screens, means for collecting and ejecting the unscreened material on the screen-su ces, and a comthe unscreened material is delivered.

21. In a pulp-strainer and in combination, a receiving-vat having luralitIy of pulp a ra ity of orizontal senses screens in said vat, means-for-coll'ectin the unscreened materia/l'fmm the-screemsu' aces and-ejecting it through sliver outlets in the vat, and' means for conveying the unscreened material to one of the screens of the series for rescreening.

22. In a pulp-strainer and in combination, a receiving-vat havin a luralit of pulp inlets and outlets, a fiurality of liorizontal screens in said vat, means for collectin the unscreened material from the screen-su aces and ejecting it through sliver-outlets in the vat and means for conveying the unscreened material to the lowermost screen of the series for rescreenin 23. In a' puIp-strainer and in combination, a receiving-vat, having a plurality of pulpdelivery outlets, a common pu -del1very passage to which said outlets de iver, and means to deflect the descending body of pulp in said assage away from said outlets.

24. n a pulp-strainer and in combination, a receiving-vat having a plurality of pulpdelivery outlets, a common delivery-passage to which said outlets deliver, and downwardly and outwardly inclined deflectorplates covering each outlet to divert'the descending bod of pulp in said passage away from said out ets.

25; In a pulp-strainer and in combination, a circular'recelvin -vat, a pulp-screen in said vat, a centrally-p aced rotatable shaft traversing said vat, and two or more fan-blades on said shaft below said screen, the blades being setso as to secure an alternating itchline and create a progressive upwar and downward movement of the material.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

JULIUS WM WALTERS.

Witnesses:

JOHN H. SHEEHAN, HENRY W. WILLIAMS. 

